CN116217178A - Ultra-high performance concrete and preparation method and application thereof - Google Patents
Ultra-high performance concrete and preparation method and application thereof Download PDFInfo
- Publication number
- CN116217178A CN116217178A CN202310281981.0A CN202310281981A CN116217178A CN 116217178 A CN116217178 A CN 116217178A CN 202310281981 A CN202310281981 A CN 202310281981A CN 116217178 A CN116217178 A CN 116217178A
- Authority
- CN
- China
- Prior art keywords
- ultra
- performance concrete
- high performance
- graphene
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 117
- 238000002360 preparation method Methods 0.000 title abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 95
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 83
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 81
- 239000002002 slurry Substances 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 48
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002131 composite material Substances 0.000 claims abstract description 34
- 229920006324 polyoxymethylene Polymers 0.000 claims abstract description 31
- 229930040373 Paraformaldehyde Natural products 0.000 claims abstract description 30
- -1 polyoxymethylene Polymers 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims description 36
- 239000002245 particle Substances 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- 235000019738 Limestone Nutrition 0.000 claims description 18
- 239000010881 fly ash Substances 0.000 claims description 18
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 18
- 239000006028 limestone Substances 0.000 claims description 18
- 239000011325 microbead Substances 0.000 claims description 18
- 229910021487 silica fume Inorganic materials 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 11
- 230000000996 additive effect Effects 0.000 claims description 8
- 239000013530 defoamer Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000002915 spent fuel radioactive waste Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 15
- 239000004567 concrete Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 29
- 230000000052 comparative effect Effects 0.000 description 27
- 239000002994 raw material Substances 0.000 description 15
- 230000036571 hydration Effects 0.000 description 11
- 238000006703 hydration reaction Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 10
- 238000012669 compression test Methods 0.000 description 9
- 239000000292 calcium oxide Substances 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 239000011148 porous material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000004721 Polyphenylene oxide Substances 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 229920000570 polyether Polymers 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- 238000012512 characterization method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000003469 silicate cement Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002956 ash Substances 0.000 description 2
- 206010003549 asthenia Diseases 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Chemical group 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002064 nanoplatelet Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/024—Graphite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
- C04B14/303—Alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides ultra-high performance concrete, a preparation method and application thereof, and particularly relates to the technical field of concrete. The ultra-high performance concrete comprises inorganic cementing materials, sand, gamma-phase alumina, graphene slurry, composite fibers and water; wherein the composite fiber comprises steel fiber and polyoxymethylene fiber. The ultra-high performance concrete provided by the invention has excellent high temperature resistance, almost no loss of residual compressive strength after the high temperature action at 600 ℃ is realized, and the loss of the residual compressive strength after the high temperature action at 1000 ℃ is only about 50%, so that the ultra-high performance concrete is suitable for special scenes with high requirements on the high temperature resistance of materials.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to ultra-high performance concrete and a preparation method and application thereof.
Background
The ultra-high performance concrete is a novel cement-based composite material designed and prepared according to the principles of closest particle packing, water-cement ratio less than 0.25, fiber reinforcement and the like, has the characteristics of ultra-high strength, toughness, durability and the like, and gradually becomes a popular choice for construction in the fields of bridges, railways, buildings and the like. The ultra-high performance concrete is applied to important members or key nodes of the building structure, and the building structure is inevitably suffered from sudden disasters such as fire disasters during service. The compact microstructure and lower permeability of the ultra-high performance concrete make the ultra-high performance concrete extremely easy to burst and peel under high temperature conditions, and directly influence the safety and service life of the building structure.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide ultra-high-performance concrete, and aims to solve the technical problems that the ultra-high-performance concrete in the prior art is not high-temperature-resistant and affects the safety and service life of a building structure.
The second purpose of the invention is to provide a preparation method of the ultra-high performance concrete.
The invention further aims to provide application of the ultra-high performance concrete in a kiln inner wall or a temporary dry storage facility of spent fuel in a nuclear power plant in thermal equipment.
In order to solve the technical problems, the invention adopts the following technical scheme:
the first aspect of the invention provides ultra-high performance concrete comprising inorganic cementing material, sand, gamma-phase alumina, graphene slurry, composite fiber and water;
wherein the composite fibers comprise steel fibers and polyoxymethylene fibers;
the inorganic cementing material comprises cement, silica fume and inorganic functional powder;
the inorganic functional powder comprises at least one of metakaolin, fly ash microbeads and limestone powder.
Further, the water reducing agent also comprises an additive, wherein the additive comprises at least one of a water reducing agent, a defoaming agent and an expanding agent.
Further, the composite fiber comprises 1000 parts by weight of inorganic cementing material, 700-900 parts by weight of sand, 14-30 parts by weight of gamma-phase alumina, 0.2-0.5 part by weight of graphene slurry, 130-150 parts by weight of composite fiber and 180-200 parts by weight of water.
Preferably, in the composite fiber, the weight ratio of the steel fiber to the polyoxymethylene fiber is 100:3-5.
Further, the average particle diameter of the gamma-phase alumina is 10 μm to 50 μm.
Preferably, the diameter of the steel fiber is 0.1mm-0.3mm, the length is 15mm-20mm, and the tensile strength is more than 2300MPa.
Preferably, the diameter of the polyoxymethylene fiber is 0.1mm to 0.3mm and the length is 5mm to 15mm.
Further, the graphene slurry includes at least one of graphene oxide slurry, multi-layer graphene slurry, and vulcanized graphene slurry.
Preferably, the solid content of the vulcanized graphene slurry is 5% -15%.
Preferably, the average particle size of the vulcanized graphene is 50-100 μm.
Preferably, the thickness of the lamellar layer of the vulcanized graphene is 1nm-2nm.
Further, the inorganic cementing material is cement, silica fume, metakaolin, fly ash microbeads and limestone powder.
Preferably, in the inorganic cementing material, the weight ratio of cement, silica fume, metakaolin, fly ash microbeads and limestone powder is 100:13-15:7-9:4-6:4-6.
Preferably, the silica fume has an average particle diameter of 0.1 μm to 0.5 μm and a specific surface area of 15m 2 /g-20m 2 /g，SiO 2 The mass fraction is more than 90%.
Preferably, the metakaolin has an average particle diameter of 1 μm to 5 μm and a specific surface area of 10m 2 /g-20m 2 /g，SiO 2 Al and Al 2 O 3 The sum of mass fractions is more than 90%.
Preferably, the average particle size of the fly ash microbeads is 5-10 μm, and the density is more than 2g/cm 3 -3g/cm 3 ，SiO 2 The mass fraction is more than 40%.
Preferably, the limestone powder has an average particle size of 3 μm to 8 μm and a density of more than 2g/cm 3 -3g/cm 3 The mass fraction of CaO is more than 50 percent.
Preferably, the sand comprises quartz sand and/or river sand.
Preferably, the sand has a particle size in the range of 20 mesh to 70 mesh.
Further, the additive comprises 10-12 parts of water reducer, 1-3 parts of defoamer and 35-40 parts of expanding agent according to parts by weight.
The second aspect of the invention provides a preparation method of the ultra-high performance concrete, which comprises the following steps:
A. adding gamma-phase alumina into graphene slurry, stirring, and then adding water with the dosage of 1/5-1/2 to uniformly disperse to obtain gamma-phase alumina/graphene solution;
B. uniformly mixing the inorganic cementing material, sand and optional additives to obtain a dry mixed material;
C. adding the gamma-phase alumina/graphene solution obtained in the step A and the rest water into the dry blend obtained in the step B, stirring, adding the composite fiber, and stirring uniformly to obtain ultra-high performance concrete slurry;
D. and pouring the ultra-high performance concrete slurry to obtain the ultra-high performance concrete.
Further, in step a, the dispersing includes ultrasonic dispersing.
The third aspect of the invention provides application of the ultra-high performance concrete in a kiln inner wall or a nuclear power plant spent fuel temporary dry storage facility in thermal equipment.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the ultra-high performance concrete provided by the invention, the graphene slurry is used for improving the microcosmic compactness of hydration products in the hydration process of the inorganic cementing material, so that the pore structure of the ultra-high performance concrete is optimized; volcanic ash reaction is carried out on gamma-phase alumina and hydration products of inorganic gel materials to form secondary hydration products, so that the pores of the ultra-high-performance concrete are further filled; hydration products and action mechanisms of the graphene slurry and gamma-phase alumina are different when the graphene slurry and the gamma-phase alumina are doped, and the hydration products and the action mechanisms are combined to further form a densification structure, so that the expansion of micropores and cracks caused by high-temperature action is delayed or inhibited, and the mechanical property of the ultra-high-performance concrete under the high-temperature action is improved. The composite fiber has good dispersibility, high strength and elastic modulus, and positive mixing effect after being added, so that the high fluidity, high strength and high toughness of the ultra-high performance concrete slurry are ensured; in addition, the polyoxymethylene fiber can form three-dimensional random distribution pore channels after being melted at high temperature, which is favorable for escaping water vapor to avoid high-temperature bursting, thereby improving the high-temperature resistance of the ultra-high performance concrete.
The compressive strength of the common ultra-high performance concrete material (reinforced by steel fibers) is obviously reduced after the material is subjected to high temperature of 600 ℃, and the compressive strength loss is as high as 80 percent after the material is subjected to high temperature of 800 ℃. The ultra-high performance concrete provided by the invention has excellent high temperature resistance, almost no loss of residual compressive strength after the high temperature action at 600 ℃ is realized, and the loss of the residual compressive strength after the high temperature action at 1000 ℃ is only about 50%, so that the ultra-high performance concrete is suitable for special scenes with high requirements on the high temperature resistance of materials.
The preparation method provided by the invention has the advantages of simple and continuous process and high degree of mechanization, and is suitable for large-scale industrial production.
The application of the ultra-high performance concrete provided by the invention provides the ultra-high performance concrete with higher heat-resistant temperature for the inner wall of a kiln in thermal equipment or temporary dry storage facilities of spent fuel in a nuclear power plant, promotes the development of the ultra-high performance concrete towards high safety and long service life, and promotes the high-speed development of a downstream industrial chain.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is an external view of the ultra-high performance concrete obtained in example 4 before (a) and after (b) the compression test;
FIG. 2 is an external view of the ultra-high performance concrete obtained in example 5 before (a) and after (b) the compression test;
FIG. 3 is an external view of the ultra-high performance concrete obtained in example 6 before (a) and after (b) compression tests;
FIG. 4 is an external view of the ultra-high performance concrete obtained in example 7 before (a) and after (b) the compression test;
FIG. 5 is an external view of the ultra-high performance concrete obtained in comparative example 1 before (a) and after (b) the compression test;
FIG. 6 is an external view of the ultra-high performance concrete obtained in comparative example 2 before (a) and after (b) the compression test;
FIG. 7 is a microstructure characterization of fibrous channels of the ultra-high performance concrete obtained in example 7;
FIG. 8 is a microstructure characterization of fibrous channels of the ultra-high performance concrete obtained in comparative example 1;
FIG. 9 is a microstructure characterization of the ultra-high performance concrete matrix obtained in example 7;
FIG. 10 is a microstructure characterization of the ultra-high performance concrete matrix obtained in comparative example 2.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated herein may be arranged and designed in a wide variety of different configurations.
The first aspect of the invention provides ultra-high performance concrete comprising inorganic cementing material, sand, gamma-phase alumina, graphene slurry, composite fiber and water;
wherein the composite fibers comprise steel fibers and polyoxymethylene fibers;
the inorganic cementing material comprises cement, silica fume and inorganic functional powder;
the inorganic functional powder comprises at least one of metakaolin, fly ash microbeads and limestone powder.
According to the ultra-high performance concrete provided by the invention, the graphene slurry is used for improving the microcosmic compactness of hydration products in the hydration process of the inorganic cementing material, so that the pore structure of the ultra-high performance concrete is optimized; volcanic ash reaction is carried out on gamma-phase alumina and hydration products of inorganic gel materials to form secondary hydration products, so that the pores of the ultra-high-performance concrete are further filled; the hydration products and action mechanisms of the graphene slurry and gamma-phase alumina are different when the graphene slurry and gamma-phase alumina are doped, and the combined action of the graphene slurry and gamma-phase alumina can further improve the mechanical properties of the ultra-high-performance concrete under the action of high temperature. The addition of the composite fiber ensures the high fluidity, high strength and high toughness of the ultra-high performance concrete slurry, and simultaneously improves the high temperature resistance of the ultra-high performance concrete. The ultra-high performance concrete provided by the invention has excellent high temperature resistance, almost no loss of residual compressive strength after the high temperature action at 600 ℃ is realized, and the loss of the residual compressive strength after the high temperature action at 1000 ℃ is only about 50%, so that the ultra-high performance concrete is suitable for special scenes with high requirements on the high temperature resistance of materials.
Gamma phase Al 2 O 3 The active oxide has the characteristics of large specific surface area, high activity and the like, and can improve the pore structure of the ultra-high performance concrete.
Polyoxymethylene fiber is an organic synthetic fiber excellent in combination properties and has a low relative density (1.41 g/cm 3 ) High tensile strength (967 MPa-1175 MPa), good alkali resistance (99%), stable long-term use, good wear resistance, etc. The molecular structure of the composite material has a large amount of ether bonds, has good compatibility with inorganic materials and high bonding strength, and can improve the toughness and the cracking resistance of the ultra-high performance concrete.
Further, the water reducing agent also comprises an additive, wherein the additive comprises at least one of a water reducing agent, a defoaming agent and an expanding agent.
In some embodiments of the invention, the water reducing agent is a polycarboxylic acid-based white powder (greater than 30% water reduction), the defoamer is a polyether-based white powder, and the swelling agent is calcium sulfoaluminate or calcium oxide.
Further, the composite fiber comprises 1000 parts by weight of inorganic cementing material, 700-900 parts by weight of sand, 14-30 parts by weight of gamma-phase alumina, 0.2-0.5 part by weight of graphene slurry, 130-150 parts by weight of composite fiber and 180-200 parts by weight of water.
In some embodiments of the invention, the weight parts of inorganic cementitious material in ultra-high performance concrete are typically, but not limited to, 1000 parts; the parts by weight of sand are typically, but not limited to, 700 parts, 750 parts, 800 parts, 850 parts, or 900 parts; the parts by weight of gamma-phase alumina are typically, but not limited to, 14, 18, 22, 26 or 30 parts; the parts by weight of the graphene slurry is typically, but not limited to, 0.2 parts, 0.3 parts, 0.4 parts, or 0.5 parts; the parts by weight of the composite fiber are typically, but not limited to 130 parts, 135 parts, 140 parts, 145 parts or 150 parts; the parts by weight of water are typically, but not limited to 180 parts, 185 parts, 190 parts, 195 parts or 200 parts.
Preferably, in the composite fiber, the weight ratio of the steel fiber to the polyoxymethylene fiber is 100:3-5. When the weight ratio of the steel fiber to the polyoxymethylene fiber is more than 100:3, the improvement effect on the high temperature resistance of the ultra-high performance concrete is not obvious; when the weight ratio of the steel fiber to the polyoxymethylene fiber is less than 100:5, the reinforcing and toughening effects on the ultra-high performance concrete are not obvious. In some embodiments of the invention, the weight ratio of steel fibers to polyoxymethylene fibers is typically, but not limited to, 100:3, 100:4, or 100:5.
Further, the average particle diameter of the gamma-phase alumina is 10 μm to 50 μm. In some embodiments of the invention, the average particle size of the gamma phase alumina is typically, but not limited to, 10 μm, 20 μm, 30 μm, 40 μm or 50 μm.
Preferably, the diameter of the steel fiber is 0.1mm-0.3mm, the length is 15mm-20mm, and the tensile strength is more than 2300MPa.
Preferably, the diameter of the polyoxymethylene fiber is 0.1mm to 0.3mm and the length is 5mm to 15mm.
In some embodiments of the invention, the length of the polyoxymethylene fibers is selected to be 14mm and 6mm, and the weight ratio of the two fibers is preferably (2-4): (0-1).
Further, the graphene slurry includes at least one of graphene oxide slurry, multi-layer graphene slurry, and vulcanized graphene slurry.
Graphene oxide as a derivative of graphene, sp 2 The hybridized carbon atom plane is distributed with oxygen-containing functional groups such as hydroxyl groups, carboxyl groups and the like in unequal quantity. Due to the existence of the oxygen functional groups such as hydroxyl, carboxyl, epoxy and the like, graphene oxide is easier to disperse in aqueous solutions and other organic solvents than graphene sheets. And (3) carrying out a vulcanization reaction on the (oxidized) graphene and a vulcanizing agent in a solvent to obtain vulcanized graphene, wherein the dispersibility of the graphene can be further improved through vulcanization.
The multilayer graphene is used as one of graphene derivatives, and the basic structure of the multilayer graphene is formed by stacking graphene with a single-layer carbon atom planar structure. The carbon atoms being bound by pi-pi bonds in the form of sp 2 And (5) hybridization. Pi-pi bonds between carbon atoms impart highly desirable mechanical properties and structural rigidity to the multi-layer graphene. It should be distinguished that there is a certain difference between the multilayer graphene and the graphene nanoplatelets, although the latter is also stacked from graphene.
Preferably, the solid content of the vulcanized graphene slurry is 5% -15%. In some embodiments of the present invention, the solids content of the graphene sulfide slurry is typically, but not limited to, 5%, 7%, 9%, 11%, 13%, or 15%.
Preferably, the average particle size of the vulcanized graphene is 50-100 μm. In some embodiments of the present invention, when the average particle size of the vulcanized graphene is typically, but not limited to, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm.
Preferably, the thickness of the lamellar layer of the vulcanized graphene is 1nm-2nm.
Further, the inorganic cementing material is cement, silica fume, metakaolin, fly ash microbeads and limestone powder.
Preferably, in the inorganic cementing material, the weight ratio of cement, silica fume, metakaolin, fly ash microbeads and limestone powder is 100:13-15:7-9:4-6:4-6. In some embodiments of the invention, the weight ratio of cement, silica fume, metakaolin, fly ash microbeads, and limestone powder is typically, but not limited to, 100:13:7:4:4, 100:15:7:4:4, 100:13:9:4:4, 100:15:9:4:4, 100:13:7:6:4, 100:15:7:6:4, 100:13:7:4:6, or 100:15:7:4:6.
Preferably, the silica fume has an average particle diameter of 0.1 μm to 0.5 μm and a specific surface area of 15m 2 /g-20m 2 /g，SiO 2 The mass fraction is more than 90%.
Preferably, the metakaolin has an average particle diameter of 1 μm to 5 μm and a specific surface area of 10m 2 /g-20m 2 /g，SiO 2 Al and Al 2 O 3 The sum of mass fractions is more than 90%.
Preferably, the average particle size of the fly ash microbeads is 5-10 μm, and the density is more than 2g/cm 3 -3g/cm 3 ，SiO 2 The mass fraction is more than 40%.
Preferably, the limestone powder has an average particle size of 3 μm to 8 μm and a density of more than 2g/cm 3 -3g/cm 3 The mass fraction of CaO is more than 50 percent.
Preferably, the sand comprises quartz sand and/or river sand.
Preferably, the sand has a particle size in the range of 20 mesh to 70 mesh.
Further, the additive comprises 10-12 parts of water reducer, 1-3 parts of defoamer and 35-40 parts of expanding agent according to parts by weight.
The second aspect of the invention provides a preparation method of the ultra-high performance concrete, which comprises the following steps:
A. adding gamma-phase alumina into graphene slurry, stirring, and then adding water with the dosage of 1/5-1/2 to uniformly disperse to obtain gamma-phase alumina/graphene solution;
B. uniformly mixing the inorganic cementing material, sand and optional additives to obtain a dry mixed material;
C. adding the gamma-phase alumina/graphene solution obtained in the step A and the rest water into the dry blend obtained in the step B, stirring, adding the composite fiber, and stirring uniformly to obtain ultra-high performance concrete slurry;
D. and pouring the ultra-high performance concrete slurry to obtain the ultra-high performance concrete.
The preparation method provided by the invention has the advantages of simple and continuous process and high degree of mechanization, and is suitable for large-scale industrial production.
Further, in step a, the dispersing includes ultrasonic dispersing.
The third aspect of the invention provides application of the ultra-high performance concrete in a kiln inner wall or a nuclear power plant spent fuel temporary dry storage facility in thermal equipment.
The application of the ultra-high performance concrete provided by the invention provides the ultra-high performance concrete with higher heat-resistant temperature for the inner wall of a kiln in thermal equipment or temporary dry storage facilities of spent fuel in a nuclear power plant, promotes the development of the ultra-high performance concrete towards high safety and long service life, and promotes the high-speed development of a downstream industrial chain.
Some embodiments of the present invention will be described in detail below with reference to examples. The following embodiments and features of the embodiments may be combined with each other without conflict. The raw materials used in the present invention are commercially available unless otherwise specified.
The following examples and comparative examples use the following material specifications:
the specific surface area of the silica fume is more than 18m 2 /g and SiO 2 The mass fraction is more than 94%.
Metakaolin has a specific surface area of about 15m 2 /g and SiO 2 Al and Al 2 O 3 The sum of mass fractions is more than 94%.
The density of the fly ash microbeads is 2.44g/cm 3 Average particle size of about 8 μm and SiO 2 The mass fraction is more than 50%.
Limestone powder density of 2.53g/cm 3 The average grain diameter is about 5 mu m and the CaO mass fraction is more than 50%.
The gamma-phase alumina was white powder with an average particle size of about 30 μm.
The solid content of the vulcanized graphene slurry is 10% of aqueous solution, the average particle size of the vulcanized graphene is 50-100 mu m, and the thickness of the vulcanized graphene is 1-2 nm.
Example 1
The embodiment provides ultra-high performance concrete, which comprises the following components: 1kg of inorganic cementing material, 0.8kg of 20-70 mesh quartz sand, 0.014kg of gamma-phase alumina, 0.0003kg of vulcanized graphene slurry, 001kg of polycarboxylic acid powder water reducer, 0.002kg of polyether powder defoamer, 0.038kg of calcium oxide expanding agent, 0.13kg of composite fiber and 0.19kg of water.
Wherein the inorganic cementing material is formed by mixing 0.76kg of PO42.5 silicate cement, 0.11kg of silica fume, 0.06kg of metakaolin, 0.03kg of fly ash microbeads and 0.04kg of limestone powder.
The composite fiber consisted of 0.125kg steel fiber and 0.005kg polyoxymethylene fiber.
The diameter of the steel fiber is about 0.2mm, the length is 18mm, and the tensile strength is more than 2500MPa. The weight ratio of the polyoxymethylene fiber diameter to the length of 14mm to 6mm of 0.2mm is 3:1.
the preparation process comprises the following steps:
1. firstly, premixing an inorganic cementing material, sand, a water reducing agent, a defoaming agent and an expanding agent for about 15 minutes to obtain an ultra-high performance concrete dry mixed material;
2. and adding gamma-phase alumina powder into the aqueous solution of the vulcanized graphene, stirring for 1min, adding about 1/2 of stirring water, diluting with water, and performing ultrasonic dispersion for about 1h to obtain the gamma-phase alumina/vulcanized graphene solution.
3. Adding the prepared gamma-phase alumina/vulcanized graphene solution and the rest of water into the ultra-high performance concrete dry mixed material, stirring for 4min, uniformly scattering steel fibers and polyoxymethylene fibers, and continuously stirring for 2min to obtain the ultra-high performance concrete freshly mixed slurry without vibrating in the whole process.
Example 2
The embodiment provides ultra-high performance concrete, which comprises the following components: 1kg of inorganic cementing material, 0.9kg of 20-70 mesh quartz sand, 0.03kg of gamma-phase alumina, 0.0005kg of vulcanized graphene slurry, 0.012kg of polycarboxylic acid powder water reducer, 0.002kg of polyether powder defoamer, 0.035kg of calcium oxide expanding agent, 0.14kg of composite fiber and 0.2kg of water.
Wherein the inorganic cementing material is formed by mixing 0.757kg PO42.5 silicate cement, 0.098kg silica fume, 0.053kg metakaolin, 0.046kg fly ash microbeads and 0.046kg limestone powder.
The composite fiber consisted of 0.13kg steel fiber and 0.01kg polyoxymethylene fiber.
The diameter of the steel fiber is about 0.2mm, the length is 16mm, and the tensile strength is more than 2500MPa.
The weight ratio of the polyoxymethylene fiber diameter to the length of 14mm to 6mm of 0.2mm is 2:1.
the preparation method is the same as in example 1.
Example 3
The embodiment provides ultra-high performance concrete, which comprises the following components: 1kg of inorganic cementing material, 0.9kg of 20-70 mesh quartz sand, 0.02kg of gamma-phase alumina, 0.0004kg of vulcanized graphene slurry, 0.012kg of polycarboxylic acid powder water reducer, 0.002kg of polyether powder defoamer, 0.04kg of calcium oxide expanding agent, 0.13kg of composite fiber and 0.2kg of water.
Wherein the inorganic cementing material is formed by mixing 0.775kg PO42.5 silicate cement, 0.1kg silica fume, 0.054kg metakaolin, 0.039kg fly ash microbeads and 0.031kg limestone powder.
The composite fiber consisted of 0.123kg steel fiber and 0.007kg polyoxymethylene fiber.
The diameter of the steel fiber is about 0.2mm, the length is 18mm, and the tensile strength is more than 2500MPa.
The weight ratio of the polyoxymethylene fiber diameter to the length of 14mm to 6mm of 0.2mm is 4:1.
the preparation method is the same as in example 1.
Example 4
The embodiment provides ultra-high performance concrete, which comprises the following components: 1kg of inorganic cementing material, 0.85kg of 20-70 mesh quartz sand, 0.025kg of gamma-phase alumina, 0.00045kg of vulcanized graphene slurry, 0.012kg of polycarboxylic acid powder water reducer, 0.002kg of polyether powder defoamer, 0.037kg of calcium oxide expanding agent, 0.15kg of composite fiber and 0.2kg of water.
Wherein the inorganic cementing material is formed by mixing 0.775kg PO42.5 silicate cement, 0.1kg silica fume, 0.054kg metakaolin, 0.039kg fly ash microbeads and 0.031kg limestone powder.
The composite fiber consisted of 0.143kg steel fiber and 0.007kg polyoxymethylene fiber.
The diameter of the steel fiber is about 0.2mm, the length is 18mm, and the tensile strength is more than 2500MPa.
The diameter of the polyoxymethylene fiber is 0.2mm and the length is 14mm.
The preparation method is the same as in example 1.
Example 5
This example provides an ultra-high performance concrete, the raw materials and preparation method are the same as example 4.
Example 6
This example provides an ultra-high performance concrete, the raw materials and preparation method are the same as example 4.
Example 7
This example provides an ultra-high performance concrete, the raw materials and preparation method are the same as example 4.
Example 8
The present embodiment provides an ultra-high performance concrete, which is different from embodiment 4 in that graphene oxide slurry is used in the raw materials to replace the vulcanized graphene slurry, the solid content of the graphene oxide slurry is 10%, and other raw materials and preparation methods are the same as those of embodiment 4, and are not described herein.
Example 9
The present example provides an ultra-high performance concrete, unlike example 4, in which the raw material was replaced with a multi-layered graphene slurry having a solid content of 10% and a particle size of 50 μm to 100 μm and a thickness of 1nm to 2nm. Other raw materials and preparation methods are the same as in example 4, and are not described here again.
Comparative example 1
This comparative example provides an ultra-high performance concrete, unlike example 4, the composite fiber consists of 0.123kg steel fiber, 0.007kg polyvinyl alcohol fiber.
The diameter of the steel fiber is about 0.2mm, the length is 18mm, and the tensile strength is more than 2500MPa.
The weight ratio of the polyvinyl alcohol fiber diameter to the length of 14mm to 6mm is 4:1.
other raw materials and preparation methods are the same as in example 4, and are not described here again.
Comparative example 2
This comparative example provides an ultra-high performance concrete, unlike example 4, in which gamma-phase alumina and graphene sulfide slurry are not added to the raw materials, and other raw materials and preparation methods are the same as example 4, and are not described here again.
Comparative example 3
This comparative example provides an ultra-high performance concrete, unlike example 4, in which no gamma-phase alumina is added to the raw materials, and other raw materials and preparation methods are the same as in example 4, and are not described here again.
Comparative example 4
This comparative example provides an ultra-high performance concrete, unlike example 4 in which the raw material is not added with the vulcanized graphene slurry, and other raw materials and preparation methods are the same as those of example 4, and are not described here again.
Test examples
The ultra-high performance concrete slurries obtained in examples 1-9 and comparative examples 1-4 were subjected to the following performance tests, as follows:
1. pouring the ultra-high performance concrete slurry into a cubic test mold with the side length of 100mm, forming 6 cubic test blocks in each group of implementation (comparison) examples, placing the test blocks in an indoor environment with the temperature of 20 ℃ and the humidity of 60% for curing for 1d, removing the mold, then transferring the test blocks into a standard curing room for curing to the age of 28d, taking out test pieces, and placing the test pieces in a ventilation drying place for natural air drying for 24h.
2. The compression test was directly performed on 3 cube test blocks in each group of the implementation (comparative) examples, and the compression test was performed after the high temperature burst test was performed on the other 3 cube test blocks. The cube compression test was carried out with reference to "standard for test method for mechanical Properties of ordinary concrete" (GB/T50081-2016), the loading rate was set to 1MPa/s, and the obtained data were recorded in Table 1.
In addition, each of the cubic test blocks before and after the high temperature treatment was weighed to determine the mass loss of the test block during the heating process, and the data are recorded in table 1.
3. High temperature burst test: the remaining 3 cube test blocks in each group of the implementation (comparison) examples are placed in a resistance type high-temperature furnace for heating, the heating speed is set to be 10 ℃/min, the temperature is maintained for 3 hours after the temperature is raised to the target temperature, and then the resistance furnace is closed for natural cooling to the room temperature (about 6 hours are needed) and then the test piece is taken out. The target temperatures of examples 1 to 4 were set to 600℃and the target temperatures of examples 5 to 7 were set to 400℃and 800℃and 1000℃respectively, and the target temperatures of examples 8 to 9 and comparative examples 1 to 4 were each set to 1000 ℃.
4. Microscopic test: in order to further explore the high-temperature action mechanism of the ultra-high-performance concrete material, samples of example 7 and comparative examples 1-2 after high-temperature action were taken, and microscopic structural characteristics of the ultra-high-performance concrete material were observed by using a microscope.
Fig. 1, 2, 3, 4, 5 and 6 correspond to the external views of the ultra-high performance concrete obtained in example 5, example 4, example 6, example 7, comparative example 1 and comparative example 2 before (a in the figure) and after (b in the figure), respectively.
As can be seen from fig. 1, fig. 2, fig. 3 and fig. 4, the ultra-high performance concrete test pieces prepared in examples 4 to 7 have no high temperature bursting phenomenon, the test pieces are whitened or turned yellow after being heated, the test pieces are complete in shape, and a few micro cracks and pore channels remained after the polyoxymethylene fibers are melted appear on the surfaces of the test pieces; comparing fig. 5 and fig. 6, it can be known that the ultra-high performance concrete test piece prepared in comparative example 1 has a small amount of corner chipping phenomenon after the temperature is high, and the ultra-high performance concrete test piece prepared in comparative example 2 has a complete shape after the temperature is high. The test piece still maintains certain integrity after being damaged by compression.
Table 1 shows the test data relating to all ultra-high performance concrete samples before and after high temperature application. Each data is an average of 3 test pieces per group, where the relative compressive strength ratio is the ratio of the residual compressive strength after high temperature to the compressive strength before high temperature.
TABLE 1
As can be seen from Table 1, the mass loss rate and the relative compressive strength ratio of the ultra-high performance concrete test pieces prepared in examples 1-4 are relatively close after the high temperature effect at 600 ℃, which indicates that the stability of the high temperature resistance of the ultra-high performance concrete prepared in the optimal section of the formula is relatively good; comparative examples 4-7 show that the high temperature of 400℃increases the compressive properties of ultra-high performance concrete, while the high temperature above 600℃adversely affects the compressive properties; comparative examples 7-9 show that the graphene slurry type has less influence on the high temperature resistance of the ultra-high performance concrete, and the effect of vulcanizing the graphene is slightly better.
Further, as compared with example 7, it is clear that: the residual compressive strength loss of the ultra-high performance concrete test piece prepared in the comparative example 1 is more serious, and compared with the polyvinyl alcohol fiber, the polyoxymethylene fiber has better effect of improving the high temperature resistance of the ultra-high performance concrete; the residual compressive strength loss of the ultra-high performance concrete test pieces prepared in comparative examples 2-4 is also more serious, which indicates that the gamma-phase alumina/graphene sulfide re-doping technology can improve the high temperature resistance of the ultra-high performance concrete.
Fig. 7, 8, 9 and 10 are microstructure features of a portion of an ultra-high performance concrete test piece. Wherein, fig. 7 and 8 correspond to microstructure feature diagrams of fiber channels of the ultra-high performance concrete obtained in example 7 and comparative example 1; fig. 9 and 10 correspond to the microstructure characteristics of the ultra-high performance concrete matrix obtained in example 7 and comparative example 2.
Comparing fig. 7 and fig. 8, it can be seen that the polyoxymethylene fiber and the polyvinyl alcohol fiber are melted to leave channels after the high temperature effect, wherein microcracks appear in the channels left by the polyvinyl alcohol fiber, and the channels left by the polyoxymethylene fiber are free of cracks, which indicates that the damage to the ultra-high performance concrete substrate caused by the melting of the polyoxymethylene fiber is smaller, thereby having higher residual compressive strength. In addition, as can be seen from comparison between fig. 9 and fig. 10, the ultra-high performance concrete doped with gamma-phase alumina/graphene sulfide has a denser microstructure after being subjected to high temperature, thereby improving the mechanical properties after high temperature.
In conclusion, the ultra-high performance concrete material prepared by the steel-polyoxymethylene fiber hybrid mode and the gamma-phase alumina/graphene sulfide composite doping technology has more excellent high temperature resistance.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The ultra-high performance concrete is characterized by comprising inorganic cementing materials, sand, gamma-phase alumina, graphene slurry, composite fibers and water;
wherein the composite fibers comprise steel fibers and polyoxymethylene fibers;
the inorganic cementing material comprises cement, silica fume and inorganic functional powder;
the inorganic functional powder comprises at least one of metakaolin, fly ash microbeads and limestone powder.
2. The ultra-high performance concrete of claim 1, further comprising an additive comprising at least one of a water reducing agent, a defoamer, and an expansion agent.
3. The ultra-high performance concrete according to claim 1, wherein the ultra-high performance concrete comprises, by weight, 1000 parts of inorganic cementing material, 700-900 parts of sand, 14-30 parts of gamma-phase alumina, 0.2-0.5 part of graphene slurry, 130-150 parts of composite fibers and 180-200 parts of water;
preferably, in the composite fiber, the weight ratio of the steel fiber to the polyoxymethylene fiber is 100:3-5.
4. A ultra-high performance concrete according to any one of claims 1-3, wherein the gamma-phase alumina has an average particle size of 10 μm to 50 μm;
preferably, the diameter of the steel fiber is 0.1mm-0.3mm, the length is 15mm-20mm, and the tensile strength is more than 2300MPa;
preferably, the diameter of the polyoxymethylene fiber is 0.1mm to 0.3mm and the length is 5mm to 15mm.
5. The ultra-high performance concrete of any one of claims 1-3, wherein the graphene slurry comprises at least one of a graphene oxide slurry, a multi-layer graphene slurry, and a vulcanized graphene slurry;
preferably, the solid content of the vulcanized graphene slurry is 5% -15%;
preferably, the average particle size of the vulcanized graphene is 50-100 μm;
preferably, the thickness of the lamellar layer of the vulcanized graphene is 1nm-2nm.
6. A ultra-high performance concrete according to any one of claims 1 to 3, wherein the inorganic cementitious material is cement, silica fume, metakaolin, fly ash microbeads and limestone powder;
preferably, in the inorganic cementing material, the weight ratio of cement, silica fume, metakaolin, fly ash microbeads and limestone powder is 100:13-15:7-9:4-6:4-6;
preferably, the silica fume has an average particle diameter of 0.1 μm to 0.5 μm and a specific surface area of 15m 2 /g-20m 2 /g，SiO 2 The mass fraction is more than 90%;
preferably, the metakaolin has an average particle diameter of 1 μm to 5 μm and a specific surface area of 10m 2 /g-20m 2 /g，SiO 2 Al and Al 2 O 3 The sum of mass fractions is more than 90%;
preferably, the average particle size of the fly ash microbeads is 5-10 μm, and the density is 2g/cm 3 -3g/cm 3 ，SiO 2 The mass fraction is more than 40%;
preferably, the limestone powder has an average particle size of 3 μm to 8 μm and a density of 2g/cm 3 -3g/cm 3 The mass fraction of CaO is more than 50%;
preferably, the sand comprises quartz sand and/or river sand;
preferably, the sand has a particle size in the range of 20 mesh to 70 mesh.
7. The ultra-high performance concrete according to claim 2, wherein the additive comprises 10-12 parts by weight of a water reducing agent, 1-3 parts by weight of an antifoaming agent and 35-40 parts by weight of an expanding agent.
8. A method for preparing ultra-high performance concrete according to any one of claims 1 to 7, comprising the steps of:
A. adding gamma-phase alumina into graphene slurry, stirring, and then adding water with the dosage of 1/5-1/2 to uniformly disperse to obtain gamma-phase alumina/graphene solution;
B. uniformly mixing the inorganic cementing material, sand and optional additives to obtain a dry mixed material;
C. adding the gamma-phase alumina/graphene solution obtained in the step A and the rest water into the dry blend obtained in the step B, stirring, adding the composite fiber, and stirring uniformly to obtain ultra-high performance concrete slurry;
D. and pouring the ultra-high performance concrete slurry to obtain the ultra-high performance concrete.
9. The method of claim 8, wherein in step a, the dispersing comprises ultrasonic dispersing.
10. Use of the ultra-high performance concrete of any one of claims 1-7 in a kiln inner wall or nuclear power plant spent fuel temporary dry storage facility in a thermal plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310281981.0A CN116217178A (en) | 2023-03-17 | 2023-03-17 | Ultra-high performance concrete and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310281981.0A CN116217178A (en) | 2023-03-17 | 2023-03-17 | Ultra-high performance concrete and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116217178A true CN116217178A (en) | 2023-06-06 |
Family
ID=86575091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310281981.0A Pending CN116217178A (en) | 2023-03-17 | 2023-03-17 | Ultra-high performance concrete and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116217178A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017092778A1 (en) * | 2015-11-30 | 2017-06-08 | Knauf Gips Kg | Building products comprising graphene or graphene oxide in the bulk material and method for producing such building products |
| CN110563409A (en) * | 2019-10-09 | 2019-12-13 | 中建商品混凝土有限公司 | steam-curing-free light and ultra-high-strength concrete and preparation method thereof |
| CN111377687A (en) * | 2020-03-24 | 2020-07-07 | 重庆高途新材料科技有限公司 | Graphene oxide low-cement-consumption ultrahigh-performance concrete and preparation method thereof |
| CN112960956A (en) * | 2021-03-23 | 2021-06-15 | 深圳大学 | Nano-modified ultrahigh-strength steel fiber concrete and preparation method thereof |
| CN114634334A (en) * | 2022-04-06 | 2022-06-17 | 湖州职业技术学院(湖州广播电视大学)(湖州社区大学) | High-performance concrete material based on nano material |
| CN115784682A (en) * | 2022-11-10 | 2023-03-14 | 湖南大学 | Fire-resistant anti-explosion ultra-high performance concrete and preparation method thereof |
-
2023
- 2023-03-17 CN CN202310281981.0A patent/CN116217178A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017092778A1 (en) * | 2015-11-30 | 2017-06-08 | Knauf Gips Kg | Building products comprising graphene or graphene oxide in the bulk material and method for producing such building products |
| CN110563409A (en) * | 2019-10-09 | 2019-12-13 | 中建商品混凝土有限公司 | steam-curing-free light and ultra-high-strength concrete and preparation method thereof |
| CN111377687A (en) * | 2020-03-24 | 2020-07-07 | 重庆高途新材料科技有限公司 | Graphene oxide low-cement-consumption ultrahigh-performance concrete and preparation method thereof |
| CN112960956A (en) * | 2021-03-23 | 2021-06-15 | 深圳大学 | Nano-modified ultrahigh-strength steel fiber concrete and preparation method thereof |
| CN114634334A (en) * | 2022-04-06 | 2022-06-17 | 湖州职业技术学院(湖州广播电视大学)(湖州社区大学) | High-performance concrete material based on nano material |
| CN115784682A (en) * | 2022-11-10 | 2023-03-14 | 湖南大学 | Fire-resistant anti-explosion ultra-high performance concrete and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 武钦风 等: "《混凝土施工与检测关键技术》", 28 February 2015, 哈尔滨工业大学出版社, pages: 115 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111377687A (en) | Graphene oxide low-cement-consumption ultrahigh-performance concrete and preparation method thereof | |
| WO2022041374A1 (en) | Modification material for low-quality aggregate and treatment method | |
| CN109678433B (en) | Ultrahigh-strength self-compacting micro-expansion steel pipe concrete and preparation method thereof | |
| CN113387646B (en) | Light expansion type ultrahigh-performance concrete and preparation method thereof | |
| CN113461372B (en) | Lightweight aggregate concrete and preparation method thereof | |
| CN114409347A (en) | Steam-curing-free low-cost ultrahigh-performance concrete and preparation method thereof | |
| CN107382346B (en) | refractory wear-resistant pouring material and preparation method thereof | |
| CN109970377B (en) | Water-soluble organic polymer toughened slag-based geopolymer cementing material and preparation method thereof | |
| CN111763050B (en) | High-strength high-throwing self-compacting micro-expansion concrete and preparation method thereof | |
| CN110627445A (en) | High-impermeability cement-based repair material for tunnel engineering and preparation method thereof | |
| CN113480257A (en) | Ultrahigh-performance concrete with high breaking strength and preparation method thereof | |
| CN111747705A (en) | Preparation method and application of special bonding mortar material for foam glass external thermal insulation system | |
| CN111689791A (en) | Method for preventing and controlling fire high-temperature bursting of ultra-high-performance concrete, structural member and application | |
| CN115925352A (en) | Explosion-suppression fire-resistant ultrahigh-performance concrete and preparation method thereof | |
| CN112209680A (en) | High-strength light-transmitting concrete and preparation method thereof | |
| CN116639935A (en) | Low-heat cement concrete without admixture and preparation method thereof | |
| CN116217178A (en) | Ultra-high performance concrete and preparation method and application thereof | |
| CN115477503B (en) | Regenerated environment-friendly concrete and preparation process thereof | |
| CN116903307A (en) | Nano silicon dioxide/hybrid fiber reinforced geopolymer concrete and preparation method thereof | |
| CN115286278B (en) | Composite additive for fly ash-based concrete and preparation method and application thereof | |
| CN115490448B (en) | Method for reducing self-shrinkage of ultra-high-performance concrete, high-strength concrete and high-strength mortar | |
| CN113003977B (en) | Composite internal curing shrinkage-reducing anti-cracking agent for concrete and production method thereof | |
| CN115304311A (en) | Ultrahigh-performance concrete and preparation method thereof | |
| CN114853417A (en) | High-toughness low-carbon anti-knock cement-based composite material and preparation method thereof | |
| CN113060990A (en) | Recycled concrete composite self-insulation building block and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |